Pin-tumbler lock



P. F. AUGENBRAUH. PIN TUMBLER LOCK. APPLICAUON man sEPT.15. 192|.

Patente July U, 1922.

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@H101 mm1 PETER F. AUGENBRAUN, 0F STAMFORD, CONNECTICUT, ASSIG-NOR TOTI-IE YALE & TOWNE MANUFACTURING COMPANY, OF STANFORD, CONNECTICUT.

PIN-TUMBLER LOCK.'

Application led September 15, 1921.

T 0 all whom t may concern Be it known that I, PETER F. AUGEN- BRAUN, acitizen of the United States, and a resident of Stamford, in the county"of Fairfield and State of Connecticut. have invented certain new anduseful Improvements in Pin-Tumbler Locks; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to improvements in pin tumbler locks and moreparticularly to means for safeguarding the tumblers of the sama-theobject of my present invention being to provide simple and efficientarmor means in the plug to prevent access to the pin tumblers by aboring tool.

With this object in view, the invention consists in certain novelfeatures of construction as hereinafter set forth and pointed out in theclaims.

In the accompanying drawings, Figure l is a side view of the plug of apin tumbler lock showing the application of my improvements thereto.Figure 2 is an end view. Figure 3 is a view showing the armor disks, andFigures 4, 5 and 6 are views illustrating a modified construction andarrangement of the armor disks.

The plug of a pin tumbler lock is illustrated at l and its key slot at2.

The plug l is made with kerfs openingr at diametrically oppositeportions of the plug and these kerfs are located one in front 0f theother. The kerfs above mentioned extend inwardly to the key slot andtheyreceive armor disks 3 and 4 respectively, so that said armor diskswill be located in the plug one in advance of the other and the inneredges of these armor disks are made irregular to conform to the contourof the key slot. Above the key slot the armor disks are formed withdiagonal edges 5-6 which are approximately in line with each other whensaid armor disks are assembled in the plug.

Specification of Letters Patent.

Patented July il, 4922.

Serial No. 500,832.

The armor disks 3 4 are made of hardened steel and instead of disposingthem vertically, one in advance of the other, as illustrated in Figuresl and 2. they may be disposed horizontally, one in advance of the otherand when so located (as in Figures 4 and 5) the armor disks may have theshape illustrated at 3a and 4"l Figure 6. It will be observed byreference to Figure 5 that the lower portion of the upper armor disk 3aoverlaps the plane of the upper portion of the lower armor disk 4a.vWhen the horizontally disposed armor disks are employed, the lower disk4n will be provided with a Slot 7 to conform to the contour of thekeyslot 2 of the plug and the lower edge of the upper armor` disk 3 willbe notched as at l8 for the accommodation of the upper portion of thekey-slot.

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is:

'1. A plug for a pin tumbler lock provided therein with hardened armordisks located one in advance of another.

2. A plug for a pin tumbler lock provided therein with hardened armordisks located one in advance of another and entering said plugalternately from dia-metrically opposite portions thereof.

3. A plug for a pin tumbler lock provided therein with hardened armordisks located one in advance of another, each of said armor disks havingportions conforming to portions of the key-slot of said plug.

4. A plug for a pin tumbler lock provided therein with verticallydisposed hardened armor disks, one in advance of another and each havingan inner edge portion to conform to the contour of portions of thekeyslot of said plug.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

PETER F. AUGENBRAUN.

Witnesses:

HERBERT A. BUTLER, CEAS. A. BERRY.

